salai. >>> there's now two tree sitters staginganenvironmentshowdown. tonight a man from fort brag who was arrested in this incident earlier this month returned to the trees. the protesters say the highway 101 bypass will devastate wetlands and pollute waters that are home to salmon and trout. they say it includes a $50 million project to wildlife. >>> peacing together the boston bombings. we talked to experts on how video and pictures that may appear useless could help break the case. >>> carnival's cost. what the company is in the process of doing. >>> and we'll show you which areas will be the coolest temperatures and possible frost in the morning. ♪ ♪ [ male announcer ] how do you engineer a true automotive breakthrough? ♪ you give it bold styling, unsurpassed luxury and nearly 1,000 improvements. the redesigned 2013 glk. the next great advance from mercedes-benz. starting at $37,090. >>> in campbell about a dozen people took part of a run. the informal run was organized by the owner of a sports shop. he said a number of his customers had qualified to run in the boston ma